RE: calling all lincoln experts........
Cheetos, don't let these guys scare you! It's not that big of a deal. In the twenty-odd years I've been a tech, I've probably seen this mistake ten or twelve times.
You're obviously going to have to replace your fuel filter, and the sensing tips of your O2s are contaminated for sure. The O2s may need to be replaced, but most of the time I've seen this mistake done, a good long highway run will burn the tips clean.
The important question: how do you get the diesel out of your tank?
You don't need to drop the tank.
You don't need to buy a siphon pump.
In your '97 Mark's underhood fuse box, there's a row of relays. The end relay closest to the PCM diode is your fuel pump relay. If you remove the relay and jump the battery power pin to the fuel pump feed pin in that relay's spot, your pump will run. The key dosn't even have to be on.
On one of the fuel rails, there's a Schraeder valve (looks just like a tire valve stem; it even has a removeable core like a tire valve)) that's used to attach fuel guages or injector flushing equipment to the vehicle.
Let's use these!
Take the cap and core out of the valve on the fuel rail. Attach a long hose to it going into a bucket or drum. Jump the fuel pump relay. The fuel pump will run. Now everything in your tank will be pumped forward, out the valve, and into the bucket. It should take about 20-30 min. to empty the tank. When the diesel stops flowing, you've drained the tank to below the level of the pump pickup.
Pull your jumper out.
Pour ~2-3 gallons of clean fuel into the tank. Put your jumper back in and drain that through.
Pull your jumper out.
Replace the fuel filter now.
Re-install the relay and put the Schraeder valve back together.
Now you're ready to start the car.
Add clean gas to the tank, as much as you can. You're going to need to dilute down the diesel left in the bottom of the tank, so don't even THINK about attempting to start with fuel from just a 1 Gal. jerry can! More is better!
Let 'er rip! The engine may crank longer. It may even flood on the first attempt. It most definitely will smoke like an SOB when it starts, but it will start!
Once the engine is running smoothly, I usually do an on-car injector flush.
Run it and drive it. Watch for the MIL/"check engine" light for a few days after. Get it scanned if the light comes on.
You may need O2s.
ONCE I saw a Taurus that needed catalytic convertors about a month later.
YOU'LL BE OK!!